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Segment Disclosures - Income before Taxes (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | $ 267,174 | $ 249,710 | $ 730,493 | $ 682,294
Equity-based compensation expense (1) |  |  | (58,680) | (51,690)
Corporate interest expense | (6,293) | (6,197) | (18,809) | (18,808)
Home Building [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 245,774 | 224,196 | 653,834 | 616,032
Corporate interest expense | (6,008) | (5,968) | (18,034) | (18,022)
Mortgage Banking [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 21,400 | 25,514 | 76,659 | 66,262
Corporate interest expense | (285) | (229) | (775) | (786)
Operating Segments [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 250,830 | 244,093 | 694,378 | 643,902
Operating Segments [Member] | Home Building [Member] | Mid Atlantic [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 124,900 | 115,180 | 348,067 | 318,447
Operating Segments [Member] | Home Building [Member] | North East [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 13,164 | 18,560 | 36,187 | 51,041
Operating Segments [Member] | Home Building [Member] | Mid East [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 50,210 | 51,744 | 125,976 | 121,129
Operating Segments [Member] | Home Building [Member] | South East [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 39,721 | 31,426 | 105,582 | 83,867
Operating Segments [Member] | Mortgage Banking [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 22,835 | 27,183 | 78,566 | 69,418
Corporate and Reconciling Items [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Income before taxes | 16,344 | 5,617 | 36,115 | 38,392
Equity-based compensation expense (1) | (20,770) | (23,586) | (58,680) | (51,690)
Corporate capital allocation | 57,887 | 55,438 | 168,621 | 160,091
Unallocated corporate overhead | (27,914) | (20,424) | (89,003) | (74,211)
Consolidation adjustments and other | 13,107 | 142 | 33,141 | 22,173
Corporate interest expense | (5,966) | (5,953) | (17,964) | (17,971)
Corporate and Reconciling Items [Member] | Home Building [Member] | Mid Atlantic [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Corporate capital allocation | 31,504 | 31,733 | 93,297 | 93,682
Corporate and Reconciling Items [Member] | Home Building [Member] | North East [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Corporate capital allocation | 5,028 | 4,565 | 14,381 | 13,325
Corporate and Reconciling Items [Member] | Home Building [Member] | Mid East [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Corporate capital allocation | 9,791 | 9,541 | 28,303 | 26,571
Corporate and Reconciling Items [Member] | Home Building [Member] | South East [Member] |  |  |  |
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] |  |  |  |
Corporate capital allocation | $ 11,564 | $ 9,599 | $ 32,640 | $ 26,513

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